Monitor arm



Fig. 1 is a top right front perspective view of a monitor arm showingour new design the broken lines are for illustrative purposes only andform no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left sideelevational view being a mirror image; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a monitor arm, as shown and described.